Magnetic Interactions in the Geometrically Frustrated Triangular Lattice AntiferromagnetCuFeO2

Abstract

The spin-wave excitations of the geometrically frustrated triangular lattice antiferromagnet CuFeO2 have been measured using high resolution inelastic neutron scattering. Antiferromagnetic interactions up to third nearest neighbors in the ab plane (J1, J2, J3, with J{2}/J{1} approximately 0.44 and J{3}/J{1} approximately 0.57), as well as out-of-plane coupling (J{z}, with J{z}/J{1} approximately 0.29) are required to describe the spin-wave dispersion relations, indicating a three-dimensional character of the magnetic interactions. Two energy dips in the spin-wave dispersion occur at the incommensurate wave vectors associated with multiferroic phase and can be interpreted as dynamic precursors to the magnetoelectric behavior in this system.

Pressure-induced polar phases in multiferroic delafossiteCuFeO2

“…caused by a slight difference in exchange interactions and the anisotropy constant [39][40][41][42]. Therefore, we anticipate that the magnetic ground state in CuFeO 2 can also be modified by hydrostatic pressure changing the exchange and anisotropy parameters.…”

Magnetic and optical properties of Fe doped crednerite CuMnO2

“…ABO 2 -type triangular-lattice antiferromagnets in which not all the interactions are minimized simultaneously, are popular examples of geometrically frustrated systems. [4][5][6][7] Crednerite CuMnO 2 is an ABO 2 -type triangular-lattice antiferromagnet. The crystal structure of CuMnO 2 contains of isosceles-triangular lattices of Mn.…”

Spin dynamics in the geometrically frustrated multiferroicCuCrO2

“…Unlike CuFeO 2 , no symmetry lowering has ever been evidenced in this compound yet. Owing to its layered topology, significant antiferromagnetic exchange coupling is expected within the plane (J ab > 0), though the influence of next-neighbour coupling J NN (which has been shown to be prominent in CuFeO 2 [11]) remains to be assessed (Figure 1a). In contrast, the rather short correlation length along the c-axis revealed by neutron experiments supports the highly 2D character of the compound, and thus a weak magnetic exchange between the planes (J c ) is expected.…”